File content as of revision 0:d0ebbde59857:

#include "mbed.h"

#define FREQ 800
DigitalOut myled(LED1);

char* codes[] = { ".-", "-...", "-.-.", "-..", ".", 
                  "..-.", "--.", "....", "..", ".---",
                  "-.-", ".-..", "--", "-.", "---", 
                  ".--.", "--.-", ".-.", "...", "-",
                  "..-", "...-", ".--", "-..-", "-.--", "--..", " " };
char* nums[] = { "-----", ".----", "..---", "...--", "....-",
                 ".....", "-....", "--...", "---..", "----." };

float cw_tick = 0.1;

PwmOut __pwm( dp24 );

void BeepOFF (void)
{
    __pwm.write(0.0);
}

void BeepON (void)
{
    __pwm.write(0.5);
}

void dot (void)
{
    BeepON(); myled = 1;
    wait(cw_tick);
    BeepOFF(); myled = 0;
}

void dash (void)
{
    BeepON(); myled = 1;
    wait(cw_tick*3);
    BeepOFF(); myled = 0;
}

void space1(void)
{
    wait(cw_tick);
}

void space3(void)
{
    wait(cw_tick*3);
}

void space9(void)
{
    wait(cw_tick*9);
}

enum { ON, SPACE };

int main() {
    int i;
    int state;
    char* ptr;

    {
        __pwm.period(1.0/FREQ);
        __pwm.write(0.0);
    };

    while(1) {
        for (i = 0; i < 27; i++) {
            state = ON;
            for (ptr = codes[i]; ;) {
                switch (*ptr) {
                case '-':
                    if (state == ON) { dash(); ++ptr; state = SPACE; }
                    else { space1(); state = ON; }
                    break;
                case '.':
                    if (state == ON) { dot(); ++ptr; state = SPACE; }
                    else { space1(); state = ON; }
                    break;
                case ' ':
                    if (state == ON) { space9(); ++ptr; state = SPACE; }
                    else { state = ON; }
                    break;
                case '\0':
                    space3();
                    state = ON;
                    goto SKIP;
                default:
                    continue;
                }
            }
            SKIP:
        }

    }
}